Most likely irritation or eczema, nothing more. I suggest applying
SarnaSarna sensitive
Sarna ultra lotion (over-the-counter) as needed for itch, and perhaps 1% hydrocortiosne cream twice a day for a few days. Avoid heat, friction, or rubbing. If that doesn't take care of it, please show a doctor.
Best.
Dr. Rockoff
Oh yeah I am still a virgin so it cant be an std.